Weathering for metallic window-sashes.



RJS. DRUMMOND.

WEATHERING FOR METALLIC WINDOW SASHES.

- APPLICATION FILED JULY 22.1915.

PutentedSept. 5, 1916.

I ATES PATENT OFFICE.

ROBERT s. DRUMMOND, or DETROIT, MICHIGAN, AssIGNon To DETROIT s EEL PRODUCTS COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OFMICHIGAN.

WEATHERING FOB, METALLIC WINDOW-SASHES.

Specification of Letters Patent.

.Patented Sept. 5, 1916.

Applieationfiled m 22, 1915. Serial N 0. 41,223.

America, residing at Detroit, in the county Of Wayne and "State of Michigan, have in-.

vented certain new and useful Improvementsin Weathering for Metallic Window. Sashes, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to metallic window sashes and frames, and it is the object of the invention to provide more effective weathering for the joints. I

n the present state of the art a common form of joint between sliding metallic window sashes and frames is formed by channel purpose.

bars having the flanges of one fitting within those of the other. The weathering is effected by contact of the. edges of the inner channel bar with the sides or bottom of the outer bar, but on account of the imperfect contact there is always more or less leakage of air. The reverse arrangement of the channels leaves a space therebetween, but

this has not heretofore served any useful With the vpresent invention I utilize this space for installing additional weathering, which greatly decreases the leakage of air between the sash and the frame.- I have further discovered that by the arrangement of this weathering ,so as to form a tortuous course for the air to pass and one having a plurality of expansion chambers, the effectiveness is greatly, increased. v v In the drawings: Figure l is a cross section through a window sash and frame'to which my improvement is applied; and Fig. 2 is a similar view showing a modified construction.

A is a metallic window sash having stiles formed of channel bar.

B is the window frame, which as shown is provided with a channel bar C fitting within the channel of the bar A, and having its flanges C slightly flaring to contact at their edges with the sash.

Within the space formed by the engagement of the bars A and B, I place a weather strip D, preferably an angle bar, one flange of which is securd to the sash rail, or stile, while the other flange extends into proximity to the bottom of the channel bar C. This latter flange also preferably ar= ranged substantially centrally between the which tends to force in around the edges of the flanges C is intercepted by the flange D, and the change ofv direction which is compelled tends to form an eddy which further interferes with leakage. In the same manner such air as doespassabout the flange D from the chamber E to the chamber E is again compelled to change its direction and form an eddy within the chamber E" which further interferes 'with leakage. Thus practical tests have demonstrated that v the weather-proof character of the joint is greatly improved by this additional Weathering.

The construction shown in Fig. 2 is the same asthat in Fig. l, with the exception of additional flanges F and F on the frame which embrace the flanges of the sash'chanpart of the sash and frame, the one fitting within the other, and additional weathering located in the space'inclosed by said channel bars comprising means for dividing said space into a plurality of air expansion chambers separated by a restricted passage, said expansion chambers being relatively large as compared with said restricted passage.

2. In a metallic window sash and frame construction, the combination of oppositely arranged channel bars respectively forming part of the sash and frame, one'fitting within the other to form restricted air. passages, and additional weathering within the space inclosed by said bars comprising a flanged member secured to the bar having the outer flanges and extending into proximity to the bottom of the channel in the opposite bar, said flanged member .with said channel bars forming separate air expansion chambers, of relatively large sine as compared with said restricted passages:

In a metallic window sash and frame construction, the combination of oppositely arranged channel bars respectively forming part of the sash and frame, one of said channel barsfittmg within the other and having its flanges slightly flared and forming re-' stricted air passages therewith, and additional Weathering located in the space inclosed by said channel bars, comprising an angle bar having one flange secured to the channel bar; the flanges of which embrace those of the others,' and the edge of said an--' gle bar extending lnpro-ximity'to the bot-' tom of the opposite channel bar, said angle bar with said channel bars forming separate air expansion chambers, of relatively large sizeas compared with said restricted passages. j I .1

4.111 a metallic window sash and frame construction, the combination with 0ppositely arranged channel bars each respectively forming part of the sash and frame, the flanges of one embracing those of the other and forming ther'ewithrestricted air tial distance from the embraced flanges of the channel'bar to form air expansion chambers and eiitending ,into proximity to the bottom of the opposite channel, said expansion chambers being relatively large as compared with said restricted passage. .7

In testimony whereof I aflix my signature.

ROBERT S. DRUMMOND. 

